• 簡介
• 源碼
• 函數說明
  • arv_camera_new
  • arv_camera_acquisition
  • arv_camera_get_model_name
  • arv_buffer_get_image_width
  • arv_buffer_get_image_height

簡介

本文針對官方常式中的第一個常式：single-acquisition做簡單的講解，並簡單分析其中調用的arv_camera_new ，arv_camera_acquisition，arv_camera_get_model_name ，arv_buffer_get_image_width ，arv_buffer_get_image_height 函數。

aravis版本：0.8.31
操作系統：ubuntu-20.04
gcc版本：9.4.0

源碼

/* SPDX-License-Identifier:Unlicense */

/* Aravis header */

#include <arv.h>

/* Standard headers */

#include <stdlib.h>
#include <stdio.h>

/*
 * Connect to the first available camera, then acquire a single buffer.
 */

int main (int argc, char **argv)
{
	ArvCamera *camera;
	ArvBuffer *buffer;
	GError *error = NULL;

	/* Connect to the first available camera */
	camera = arv_camera_new (NULL, &error);
    //camera = arv_camera_new ("192.168.6.23", &error);

	if (ARV_IS_CAMERA (camera)) {
		printf ("Found camera '%s'\n", arv_camera_get_model_name (camera, NULL));

		/* Acquire a single buffer */
		buffer = arv_camera_acquisition (camera, 0, &error);

		if (ARV_IS_BUFFER (buffer)) {
			/* Display some informations about the retrieved buffer */
			printf ("Acquired %d×%d buffer\n",
				arv_buffer_get_image_width (buffer),
				arv_buffer_get_image_height (buffer));
			/* Destroy the buffer */
			g_clear_object (&buffer);
		}

		/* Destroy the camera instance */
		g_clear_object (&camera);
	}

	if (error != NULL) {
		/* An error happened, display the correspdonding message */
		printf ("Error: %s\n", error->message);
		return EXIT_FAILURE;
	}

	return EXIT_SUCCESS;
}

此常式較為簡單，每一步的細節查看註釋即可，此處不過多講解。
運行結果：

函數說明

arv_camera_new

簡介：創建一個ArvCamera對象，如果name是NULL，則連接第一個可用的相機。

ArvCamera* arv_camera_new (const char* name, GError** error)

如果是Gige相機，name的格式可以是：

• <vendor>-<model>-<serial>
• <vendor_alias>-<serial>
• <vendor>-<serial>
• <user_id>
• <ip_address>
• <mac_address>

例如：

• The Imaging Source Europe GmbH-DFK 33GX265-39020369
• The Imaging Source Europe GmbH-39020369
• TIS-39020369
• 192.168.0.2
• 00:07:48:af:a2:61

Available since 0.8.0

arv_camera_acquisition

簡介：獲取一幀圖像。
註意：①本函數會將相機設置為單幀採集模式②返回的buffer最終必須要通過g_object_unref()釋放

ArvBuffer* arv_camera_acquisition(
	ArvCamera* camera,         
	guint64 timeout,     //採集超時時間，單位µs
	GError** error)

Available since: 0.8.0

arv_camera_get_model_name

簡介：獲取相機型號名稱

const char* arv_camera_get_model_name (ArvCamera* camera, GError** error)

Available since 0.8.0

arv_buffer_get_image_width

簡介：獲取圖片的width
註意：此函數只能在buffer payload為ARV_BUFFER_PAYLOAD_TYPE_IMAGE、ARV_BUFFER_PAYLOAD_TYPE_EXTENDED_CHUNK_DATA或ARV_BUFFER_PAYLOAD_TYPE_MULTIPART時使用

gint arv_buffer_get_image_width(ArvBuffer* buffer)

Available since: 0.4.0

arv_buffer_get_image_height

簡介：獲取圖片的height
註意：此函數只能在buffer payload為ARV_BUFFER_PAYLOAD_TYPE_IMAGE、ARV_BUFFER_PAYLOAD_TYPE_EXTENDED_CHUNK_DATA或ARV_BUFFER_PAYLOAD_TYPE_MULTIPART時使用

gint arv_buffer_get_image_height(ArvBuffer* buffer)

Available since: 0.4.0